linux-kernel - Re: Why is kslowd accumulating so much CPU time?

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Message-ID: <22070.1276110045@redhat.com>
Date:	Wed, 09 Jun 2010 20:00:45 +0100
From:	David Howells <dhowells@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	dhowells@...hat.com, "Theodore Ts'o" <tytso@....edu>,
	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Why is kslowd accumulating so much CPU time?

David Howells <dhowells@...hat.com> wrote:

> > Is there any way to easily see what is scheduling themselves to use the
> > slow workqueue?
> 
> Slow work has debugging.  Turn on:
> 
> 	CONFIG_SLOW_WORK_DEBUG=y
> 
> then do:
> 
> 	watch -n0 cat /sys/kernel/debug/slow_work/runqueue

I documented this, of course.  Look in:

	Documentation/slow-work.txt

in section "VIEWING EXECUTING AND QUEUED ITEMS".

David
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